 If you liked
Blood+
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 ...then you might like
Ga-Rei: Zero
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Girl with a Sword fighting off evil monster that attack humankind, struggling with the truth and loved ones around her. In my eyes its almost exactly like Ga-Rei: Zero. You could almost call them sisters.
Both series consists of fighting the supernatural (among them demons) with the art of swordsmanship.
The main female protagonist in both series are strong and possesses extraordinary abilities but also harbors a dark past.
Both series contain themes of tragedy, drama, action, and emotions later on.